More than 5,000 tablet computers with counterfeit safety markings on their electrical adapters were confiscated by U.S. Customs and Border Protection officers and import specialists at the Los Angeles/Long Beach seaport complex, the agency announced Friday.

Officers saw the fake safety markings on the adapters in a shipment of 5,101 tablet computers from China.

The fake markings indicated the adapters had been inspected by ETL Listed Mark and Underwriters Laboratories, which are independent organizations that test products for fire, shock and/or personal injury risks to consumers and certify products when they meet safety standards.

"Of paramount importance, for CBP officers and import specialists is the protection of consumers, particularly when counterfeit electronic equipment may pose unsafe risks to the unsuspecting public," Todd C. Owen, Customs director of field operations in Los Angeles, said in a statement.

Seized tablets and adapters will likely be destroyed if forfeited, the agency said. There were 4,705 9-inch and 396 7-inch tablets with chargers with a combined suggested retail price of $898,328.

Electrical devices with potential safety or security risks accounted for 17 percent of products seized by Customs and Border Protection in 2011. They have an estimated domestic value of $10.2 million, according to the agency.